While many top hedge funds have eased the lockup and redemption terms that made many infamous during the financial crisis three years ago, at least one is sticking tightly to the onerous rules it put into place when it launched more than seven years ago.

Eton Park Capital Management continues to give investors a chance to redeem only once every 27 months—if an investor misses a window, he or she must wait another 27 months. In order to do so, they must give 65 days notice, and can only pull one-third of their money any year. Those that do redeem must wait another month after the redemption date to actually get their money, Fortune magazine reports.

What's more, Eton Park still reserves the right to employ one of the most hated features of the hedge fund industry: side pockets. And it can put up to 30% of its assets in those side pockets.

That may be why the $12 billion firm saw only 5% net redemptions last year, despite break-even performance over the past three years and an 11% loss last year.

"We are redeeming as much as we can and as fast as we can," one investor, who gave Eton Park his money in 2008, told Fortune.

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We are accustomed to splitting trading into technical and fundamental buckets. Both involve crunching data; one set includes market fundamentals and the other pure price data. Alternative data is a third bucket that is gaining traction.